Ergo calculator



FIG. 1 is a perspective view of an ergo calculator showing our new design;

FIG. 2 shows a front elevation view thereof;

FIG. 3 shows a rear elevation view thereof;

FIG. 4 shows a left side elevation view thereof;

FIG. 5 shows bottom plan view thereof shown in larger scale; and,

FIG. 6 shows a top plan view thereof shown in larger scale.

The broken lines depict environmental structure only and form no part of the claimed design. 

The ornamental design for an ergo calculator, as shown and described. 